; Tramp: fixes resulting from test campaign

; Tramp: fixes resulting from test campaign

* lisp/net/tramp-gvfs.el (tramp-gvfs-do-copy-or-rename-file):
Handle symlinks.

* lisp/net/tramp-sshfs.el (tramp-sshfs-handle-process-file):
STDERR is not implemented.

* lisp/net/tramp.el (tramp-skeleton-process-file): Raise a warning
if STDERR is not implemented.
(tramp-handle-shell-command):
Respect `async-shell-command-display-buffer'.

* test/lisp/net/tramp-tests.el (tramp-test28-process-file): Adapt test.

(cherry picked from commit f6632114fe661930c45b5e9c1bf66644be095ff9)